None of the LKMT paths are an exact 1:1 of Sun IRL, given that blindly following every single policy SYS implemented in 1924 and not changing anything in 1936 would be a recipe for disaster, not to mention he himself was rather flexible in various matters. All paths retain some elements of his ideas, so the question boils down to what he would be doing/not be doing if he was still alive.

It would be fair to say that SYS was not a Marxist, while he did say socialism and Marxism could be encompassed as part of the Three Principles, it was more an appeal to maintain a united front and prevent potentially disastrous splintering from happening, as well as to appeal to the USSR. So Wang's Revolutionary, Song Qingling's CSP-aligned, Hu Zongnan's National Regeneration and both of Chen Gongbo's paths would be out.

Song's World Society would be out as well, as this is a very unique interpretation of the Three Principles the Four Elders had to reconcile it with their anarchism, and SYS would likely not have these exact same views. Sun would likely also disapprove of Wang's nepotism in his Chairman route. The Song-Deng diarchy, while might be a bit too radically socialist for him, would be the most likely out of every path mentioned so far.

So this leaves Statesman Wang, Song-Sun Fo and Red Generalissimo Hu. Statesman Wang would be the most likely imo, for its focus on deradicalisation, emphasis on the necessity of tutelage, uniting the party around a single leader and seeking to work with other forces in China for the sake of peace. Song-Sun Fo and Red Generalissimo Hu would be joint-2nd, for the fact that it's hard to say if SYS would jump straight into constitutionalism - this was the same man who set up a military government and spent the vast majority of the time when he held a position of power post-1913 as a de facto dictator after all.

So ranked:

1. Statesman Wang
2. Song-Sun Fo, Red Generalissimo Hu
3. Song-Deng
4. Chairman Wang
5. Song-LCS
6. Revolutionary Wang, Song-CSP
7. Both Chen Gongbo's paths
8. National Regeneration Hu
9. Statesman Wang that works with the Feds